Standard Oka/Perkins turbo

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Pete Fox
Member
Posts: 140
There have been a number of queries about what the Oka turbo actually is, and what can replace it (exactly). I have been looking into this very question and the answers are only partly satisfactory.

e.g. From Peter James
"I know i've asked this before on another specific post but received no replies.
Does anyone know the model/part number of the Oka turbo and also the part number for a wastegated replacement." here
and from Dave Ribbans
"I found very little data on this model so some advice from experts is needed ... The Oka part number is DET 2674394 and if you search for 2674394 (which is also a Perkins OEM part number) you'll find some references to the T31 but it's a mire out there".

So I have found out the following:
The Oka turbo is a Garrett TA3120 - Perkins part number 2674394
The standard turbo is interchangeable with one from a JCB (excavator/backhoe??) with a Perkins Engine Type: T4.40 and has a Garrett Turbo Model: TA3120 JCB OE Part Number Is: 2674394 which is the same as the Oka.

Standard turbo



JCB/Perkins also fitted a wastegated turbo to the same engine.
JCB Perkins Engine Type: T4.40 Turbo Model: Garrett model GT2052, JCB OE Part Number Is: U2674A326 & U2674A328.
I cannot ascertain however whether the turbo is a straight bolt on job or whether there are other parts required. check it out here




For those wanting to upgrade to a modern turbo the one in common use is a Garrett GT2860RS (Disco Potato). This will not bolt straight up and requires adapters etc. and some plumbing for the water cooling. There are a million options with different turbines and housings, as Dave says " it's a mire out there". I was quoted anything from $1150 ex US to $1750 for an Aust supplier. The same supplier also quoted $6600 for a drive in drive out fitting with an intercooler.

I have found an alternate supplier (UK) for a new genuine original antique turbo at a reasonable price - $ 670 delivered to Aust. I have one of these on order. I am a bit unsure about the exhaust fitting on this, which may be different but as 266 has a small crack in the cast dump pipe I was going to have to do something anyway.

So I can hear the head scratching "why would this guy buy an obsolete turbo that seems to be the main source of complaints about the lack of power for this engine?"

Well 266's turbo has an oil leak that's getting worse. In Tassie where I am at the moment and where we are moving to, the Oka with a 2.2 tonne van on behind has been pulling really well, it has actually got all I really want power wise on the windy roads down here, but this is only true while the temperatures remain as low as they are now (daytime 12 ~ 17 degC). In summer on the mainland it is a pig. I am going to try to correct this.

OK, so this is to do with oxygen density due to the lower temps and the best way to increase oxygen density in higher temps in my view is with a water to air intercooler (a large one). As soon as I pick one out from the thousands of choices available and sort out the cheap Chinese ones from the quality ones I'll be going down this route. I am concerned that a cheap one is inviting trouble, because a water leak from one of these will be terminal for the engine.

Hope this info is of use to someone
Pete

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Peter Fox

OKA 266 Multi-cab.

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May 8, 2012 at 1:57 PM Flag Quote & Reply

Aussie Bight Expeditions
Member
Posts: 109
Hi Peter,
Interesting on my part as we ran two of the JCB motors in our loadalls on the farm in WA. Found this out as we had to replace a few seals on the water system. Tried to change over to their starter motor for the same engine, but to no avail as they are totally different in their length at the gear end due to our bellhousing being so different. Do agree that they run well when it is cold and also raining due to the density of the air. Also have heard of someone trying water mist into the motor to create better HP and I cannot remember who it was, but was on an OKA.
Regards
ABE Tony
May 8, 2012 at 3:44 PM Flag Quote & Reply

Outback Jack
Member
Posts: 381
Any updates

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August 12, 2012 at 10:09 PM Flag Quote & Reply

chris @ shirley james
Member
Posts: 17
Hello all, just to muddy the waters a little more, #96 is fitted with a Schwitcher turbo, German made and according to Alan Gorham and Robin Wade were fitted to some XTs. Regards Chris
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August 26, 2012 at 10:18 PM